<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	
//var a = 1;
/*
for(;a<5;){
	a++;
	alert(a);
}
*/
/*
for(var i=0;i<10;i+=2){
	alert(i)
}
*/
/*
for(var i = 0;i < 10;i++){
}
alert(i);
*/
//alert(1),alert(2);
//var a = 10,b = 15,c = 20;
//alert(c);
/*
for(var i =0;i<5,i<3;i++){
	alert(i);
}
*/
var i =0;
for(;true;){
	console.log(i);
	i++;
}

</script>
</body>
</html>